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LM25007 Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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LM25007 Datasheet(HTML) 3 Page - National Semiconductor (TI) |
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3 / 12 page  Pin Descriptions Pin Name Description Application Information 1 SW Switching Node Power switching node. Connect to the inductor, bootstrap capacitor, and free-wheeling diode. 2 BST Boost Boot–strap capacitor input An external capacitor is required between the BST and the SW pins. A 0.01µF ceramic capacitor is recommended. 3 RCL Current Limit OFF time programming pin A resistor between this pin and RTN sets the off-time when current limit is detected. The off-time is preset to 17 µs if FB = 0V . 4 RTN Circuit Ground 5 FB Feedback Signal from Regulated Output This pin is connected to the inverting input of the internal regulation comparator. The regulation threshold is 2.5V. 6 RON/SD On-time set pin A resistor between this pin and VIN sets the switch on-time as a function of Vin. The minimum recommended on-time is 300ns at the maximum input voltage. 7 VCC Output from the internal high voltage bias regulator. If an auxiliary voltage is available to raise the voltage on this pin above the regulation setpoint (7V), the internal series pass regulator will shutdown, reducing the IC power dissipation. Do not exceed 14V. This output provides gate drive power for the internal Buck switch. An internal diode is provided between this pin and the BST pin. A local 0.1uF decoupling capacitor is recommended. 8 VIN Input supply voltage Recommended operating range: 9V to 42V. - EP Exposed pad, underside of the LLP package option Exposed metal pad on the LLP package underside. It is recommended to connect this pad to the PC board ground plane to aid in heat dissipation. www.national.com 3 |
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